/* $NetBSD: riscv_platform.c,v 1.2 2023/06/12 19:04:13 skrll Exp $ */

/*-
* Copyright (c) 2023 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Nick Hudson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

/*
* This is the default RISC-V FDT platform implementation. It assumes the
* following:
*
*  - Console UART is pre-configured by firmware
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: riscv_platform.c,v 1.2 2023/06/12 19:04:13 skrll Exp $");

#include <sys/param.h>
#include <sys/bus.h>

#include <dev/fdt/fdtvar.h>

#include <uvm/uvm_extern.h>
#include <uvm/pmap/pmap_devmap.h>

#include <riscv/fdt/riscv_fdtvar.h>

static const struct pmap_devmap *
riscv_platform_devmap(void)
{
       static const struct pmap_devmap devmap_empty[] = {
               DEVMAP_ENTRY_END
       };

       static struct pmap_devmap devmap_uart[] = {
               DEVMAP_ENTRY(VM_KERNEL_IO_BASE, 0, PAGE_SIZE),
               DEVMAP_ENTRY_END
       };
       bus_addr_t uart_base;

       const int phandle = fdtbus_get_stdout_phandle();
       if (phandle <= 0)
               return devmap_empty;

       if (fdtbus_get_reg(phandle, 0, &uart_base, NULL) != 0)
               return devmap_empty;

       devmap_uart[0].pd_pa = DEVMAP_ALIGN(uart_base);

       return devmap_uart;
}


static u_int
riscv_platform_uart_freq(void)
{
       return 0;
}

static const struct fdt_platform riscv_platform = {
       .fp_devmap = riscv_platform_devmap,
       .fp_bootstrap = riscv_fdt_cpu_bootstrap,
       .fp_uart_freq = riscv_platform_uart_freq,
       .fp_mpstart = riscv_fdt_cpu_mpstart,
};

FDT_PLATFORM(rv, FDT_PLATFORM_DEFAULT, &riscv_platform);